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Quiz 2
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Q.1
Thiol group is present in [ IIT 2016]
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a) cyctine
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b) cystein
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c) methionine
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d) cytosin
Explanation
Answer:(b)
Q.2
Which of the following pairs give positive Tollen's test? [ IIT 2004]
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a) Glucose, sucrose
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b) Glucose, fructose
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c) Hexanal, acetophenone
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d) Fructose, sucrose
Explanation
Answer:(b)
Q.3
During the process of digestion, the proteins present in food materials are hydrolysed to amino aacids. the two enzymes involved in the process are respectively
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a) amylase and maltase
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b) diastase and lipase
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c) pepsin and trypsin
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d) invertase and zymase
Explanation
Answer:(c)
Q.4
Which functional group participates in disulphide bond formation in proteins? [ AIPMT 2005]
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a) Thiolactone
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b) Thiol
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c) Thioether
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d) Thioester
Explanation
Answer:(b)
Q.5
The cell membranes are mainly composed of [ AIPMT 2005]
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a) carbohydrates
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b) proteins
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c) phospholipids
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d) fats
Explanation
Answer:(c)
Q.6
Synthesis of each molecule of glucose in photosynthesis involves ... [ IIT 2013]
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a) 18 molecules of ATP
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b) 10 molecules of ATP
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c) 8 molecules of ATP
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d) 6 molecules of ATP
Explanation
Answer:(a)
Q.7
Assertion: Starch is consists of amylose and amylopectin Reason: The glucose molecules in starch joined by α1,4 linkage
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a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
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b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
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c) Assertion is true, but Reason is false
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d) Assertion and Reason are false
Explanation
Answer:(b)
Q.8
The helical structure of protein is stabilised by ...[ AIPMT 2004]
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a) dipeptide bonds
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b) hydrogen bonds
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c) ether bonds
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d) peptide bonds
Explanation
Answer:(b)
Q.9
Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution? [ IIT 2017]
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a)
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b)
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c)
0%
d)
Explanation
Answer:(a)
Q.10
Number of chiral carbon atoms in β-D-(+)-glucose is ...[ AIPMT 2004]
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a) five
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b) six
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c) three
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d) four
Explanation
Answer:(a)
Q.11
he correct statement in respect of protain haemoglobin is that it ....[ AIPMT 2004]
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a) functions as a catalyst for biological reactions
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b) maintains blood sugar level
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c) act as an oxygen carrier in the blood
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d) forms antibodies and offers resistance to diseases
Explanation
Answer:(c)
Q.12
The hormone that helps in the conversion of glucose to glycogen is ... [ AIPMT 2004]
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a) cortisone
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b) bile acids
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c) adrenaline
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d) insulin
Explanation
Answer:(d)
Q.13
A sequence of how many nucleotides in messenger RNS makes a codon for an amino acid? [ AIPMT 2004]
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a) Three
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b) Four
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c) One
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d) Two
Explanation
Answer:(a)
Q.14
Which of the following is incorrect statement? [ AIPMT 2001]
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a) Starch is a polymer of α-glucose
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b) Amylose is a component of cellulose
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c) Proteins are composed of only type of amino acid
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d) In cyclic structure of fructose, there are four carbons and one oxygen atom
Explanation
Answer:(a)
Q.15
Chargaff's rule states that in an organism ...[ AIPMT 2003]
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a) amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)
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b) amounts of all bases are equal
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c) amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
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d) amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
Explanation
Answer:(c)
Q.16
Phospholipids are esters of glycerol with ... [ AIPMT 2003]
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a) one carboxylic acid residue and two phosphate groups
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b) three phosphate groups
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c) three carboxylic acid residues
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d) two carboxylic acid residues and one phosphate groups
Explanation
Answer:(d)
Q.17
Vitamin-B12 contains ... [ AIPMT 2003]
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a) Zn(II)
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b) Ca(II)
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c) Fe(II)
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d) Co(II)
Explanation
Answer:(d)
Q.18
Which is not true statement? [ AIPMT 2002]
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a) α-carbon of α-amino acid is asymmetric
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b) All proteins are found in L-form
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c) Human body can synthesise all proteins thay need
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d) At pH = 7 both amino anda carboxylic groups exist in ionised form
Explanation
Answer:(b)
Q.19
Which statement is incorrect about peptide bond [AIPMT 2001]
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a) C - N bond length in proteins is longer than usual bond length of C-N bond
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b) Spectroscopic analysis show planar structure of
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c) C - N bond length in proteins is smaller than usual bond length of C - N bond
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d) None of the above
Explanation
Answer:(c)
Q.20
hich one of the following bases is not present in DNA? [ IIT 2014 ]
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a) Quinoline
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b) Adenine
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c) Cytosine
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d) Thymine
Explanation
Answer:(a)
0 h : 0 m : 1 s
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